She had heard that the National Stadium, also known as the Bird's Nest, was difficult in her previous life, but after living in two lifetimes, it was still rare for her to grin when she saw the drawings. When Jiang Wei saw the drawings, he couldn't help but be shocked by the complexity of the various techniques on the drawings!
From design creativity to architectural style, this stadium is unique in the world. The stands here are designed to be more stringent, with unique requirements in terms of quality and appearance, and precise construction requirements to control every specific construction link. According to the design requirements, both the appearance quality requirements and the component concrete grade strength of the bleacher board are the first in the history of precast concrete component production. The required effect is to stand at the highest end of the stadium and look from a distance to make the entire stands look smooth and flat, with uniform lines, orderly, beautiful, natural and fresh, and to fully reflect the beauty of concrete returning to its original nature.
If you want to make fair-faced concrete, there are many things to consider compared to making decoration. The effect of the concrete must be exactly the same, and the color must be uniform.
This is too difficult. The internal reinforced concrete stands of the "Bird's Nest" are divided into three layers: upper, middle and lower. They are formed by prefabricated fair-faced concrete stands that are connected and fixed to the cast-in-place main structure through structural nodes. The precast concrete components of the three-story grandstand include three types: bleacher panels, steps and stairs. The total number of components is approximately 1,264 models, including 1,264 bleacher panels, 4,600 steps and 70 stairs. There are seven main types of bleacher boards: L-shaped, L+U-shaped, T-shaped and straight-shaped. The maximum width is 1.25 meters, the maximum length is 11.3 meters, and the maximum height is 0.74 meters. The maximum weight of a single bleacher board is about is 18.1 tons.
Regardless of the length and shape of the component, this component is easily deformed. In addition, the tonnage of this single component requires more than 18 tons! How big a tower crane can be used to complete this project, but this is not the focus of their consideration. In fact, there have been many very large tower cranes in later generations, with the maximum lifting capacity reaching more than 50 tons. However, I don’t know if such a tower crane exists in this era. She cannot suggest that people temporarily produce such large tower cranes. I can only silently give some wax to the construction unit, which is really difficult! However, what is more difficult now is the in-depth design of this component, which requires that the cast-in-place base layer of this structure must be poured extremely flat, and the positioning accuracy of the embedded bolts must be extremely accurate! Therefore, Li Yu requires the construction unit to start from both sides. The first is the flatness of the base layer and the positioning accuracy of the embedded bolts. They should be as flat as possible. Once there is a deviation, there is a possibility that there will be components behind the stand that cannot be installed. Once you can't make changes, it will delay the big thing!
In addition, the detailed design of components introduced a special technology, bIm construction technology, for the first time. What is bIm construction technology? This concept came so suddenly that everyone was caught off guard. As a person from later generations, Li Yu popularized bIm technology to them. The so-called bIm is building Information modeling, that is to say, on the basis of cAd drawings, 3D modeling is carried out, and all the construction methods are deepened into three-dimensional graphics.
The first time you came into contact with bIm in-depth design was when it was developed by the company that makes cAd graphics software. What is cAd? It is a software for drawing building vertical sections and water and electricity construction drawings. This software company later developed three-dimensional graphics, and then developed 3D three-dimensional graphics. Although the engineers drew it very quickly, in the end it was simulated in advance using the software. The shape of the bird's nest and the construction techniques at each stage.
They summoned the general contractor and component factory and asked them about the detailed design drawings of the components. The biggest problem now is that the components are abnormally shaped and easy to deform and cannot be dealt with. Furthermore, the steel bars in the components are very complicated and how to accurately reserve bolt holes. Another problem is how to hoist the 18-ton component!
Each issue is more difficult than the last. Li Yu saw that the hair on the head of the construction unit's chief foreman was getting thinner and thinner. After Li Yu thought for a while, he proposed that some new materials and technologies could be used to solve the problem of component deformation. Instead of using a balance beam, it is a large steel beam with several more hanging points on it. The steel beam itself will not deform. Use it to solve the problem of irregular shapes and easy deformation of components. This steel shoulder pole was widely used in prefabricated hoisting projects in later generations, but now it is indeed an insurmountable problem. But then the problem came again. Together with the steel pole and hook spreader, it added another 2 tons of weight to the tower crane.
For the problem of accurate reserved bolt holes, bIm technology can be combined with bIm technology to conduct more precise design and simulation to ensure that the location and size of bolt holes are accurate. Then use the computer to automatically open holes. As long as the mold is ready, the components will not be bad, so the hole positions of the mold can be accurately reserved.
As for lifting 20 tons of weight, you can consider using a large crawler crane for construction. Tower cranes are indeed very expensive because the cost is too high. Then we need to use a large-tonnage crawler crane, and we have to make a demonstration for the crane. After all, the venue is too big and requires too many crane stations!
After listening to Li Yu’s suggestion, the chief engineer’s eyes flashed with hope. Turning around to look at some experts, the experts also thought that they could give it a try. They were more satisfied with the steel pole and crawler crane, but this bIm could not be seen or touched, and several old experts were also worried. They asked the construction unit to first conduct the two studies they agreed to, and the construction unit immediately organized a team to conduct research to try to find a feasible solution. After a month of hard work, they finally made some progress. The balance beam has been successfully developed, and after testing, it can effectively improve the problem of abnormal shapes and deformation of the components; while the crawler crane works well around the perimeter, but cannot solve the construction problem in the middle, so Li Yu proposed to decompose the venue into 45 For a certain section of the building, a section is reserved for no construction, and finally this section is closed so that the crane can construct in the middle, thus solving the hoisting problem.
However, bIm technology has not been progressing smoothly. Experts still do not trust this bIm. How can its in-depth application be implemented? Li Yu saw that this matter was not going to work, so she volunteered to work on it and stared at the detailed model. In order to make the reservation of bolt holes more accurate, she decided to stay in the component factory for a while until the mold was processed before leaving.
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Engineers were deepening bIm in the component factory, and Li Yu watched them carry out construction. One day, the engineer sent the drawing to Li Yu, who reviewed it with a not-so-fast computer. She I felt that the drawing was too rough in many places, and I thought the engineers should change it, so I found them. After Li Yu pointed out the problems in the picture, the engineers gathered around to check it out. But one of the engineers felt that Li Yu had too many things to do, and muttered: "What's so great, you haven't even graduated yet, let alone a major university, you are so arrogant, what does it matter if you are just a few millimeters behind?" I heard that the weather was getting hotter and hotter, and Li Yu suddenly became popular! "What did you just say? Is this because I have too many things to do!? Do you know that we have issued a military order? This is a national key project, the Olympic Games, and the whole world is watching! You are so slack at work, I will ask you when the time comes What to do if it can’t be installed? What’s wrong with a few millimeters? Let me tell you, if you can’t install it, it won’t solve the problem! Although I am young, I have a sense of responsibility. If you don’t have a sense of responsibility, you don’t have to work here, or your team should leave here!
Their team leader realized that there were indeed deficiencies in the drawing and said that he would revise it as soon as possible and hoped that Li Yu would not follow him again! The engineer pursued, but Li Yu said nothing more. In the next few days, the engineers worked overtime to redraw the graphics. Li Yu also paid attention to the progress and provided necessary opinions and suggestions. Suggestions.
After working together, the resulting bIm deepening graphics became more refined and accurate. Li Yu was satisfied with the results and spoke highly of the engineers' professionalism.
They then used the deepened graphics to make molds, and the deepening team was here to keep an eye on the molds. This improvement is expected to further improve construction quality and efficiency, laying a solid foundation for the successful construction of the "Bird's Nest". < /p>
After the mold was completed, Li Yu and the engineers came to the site for installation testing. When the first prefabricated bleacher board was firmly installed on the main structure, everyone breathed a sigh of relief.
"Success! " Cheers rang out on the construction site.
This attempt not only solved the previous problems, but also provided valuable experience for subsequent construction. As the project progresses, more prefabricated components will be added. After the installation was in place, the shape of the "Bird's Nest" gradually emerged.
During this process, Li Yu also deeply realized the power of teamwork. She understood that individual ability alone is the best.It is impossible to complete such an arduous task. Only by working together can we overcome one difficulty after another.
Looking at the rising "Bird's Nest", Li Yu's heart is filled with pride. She knew that it contained the hard work and efforts of countless people. And she feels extremely honored to be able to participate and contribute her part.
And this is all for later. Many stories happened in the achievement of this project. Such an extremely difficult key project made everyone suffer a lot and overcome many difficulties. Every day Anyone who works hard for the completion of a project deserves to be respected, and anyone who wants to cut corners or shoddy work during the project will be punished. Not only did Li Yu grow up, but Jiang Wei, Zhao Heng, Tan Fei, and Cheng Yu also became successful this time. All of a sudden, they rose to different heights.